It offers full coverage of how materials are made or obtained, their physical properties, their mechanical properties, how they are used in construction, how they are tested in the lab, and their strength characteristics--information that is essential for material selection and elementary design.
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They are used principally when their mechanical properties are mandatory.
它们主要用在必须使用其机械性质的地方。
The experiments show that ethanolamine additives added to the composites improve their mechanical properties remarkably.
结果表明：醇胺类助剂加入复合物后显著改善其力学性能。
These involve changes to the lithium chemistry of batteries, their mechanical properties and the electronics that control them.
这将改变电池的化学成分、机械特性以及控制电路。
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